special 404 errors

Hi,

My blog is https://www.niftymiracle.com

Im experiencing a strange error,

whenever I publish a post, along with the page a 404 error is also forming with extension as site name – https://www.abc.com/post/www.abc.com

so If I have 300 pages, 300 errors are showing

Eg:If I write a post on nifty and my URL is https://www.niftymiracel.com/nifty
its reflecting a 404 error in google webmaster and all other seo softwares with url https://www.niftymiracle.com/nifty/www.niftymiracle.com

Strangly crawlers are showing the referee page for that 404 error as https://www.niftymiracle.com/nifty but I dont understand where link is there?

Please help where I did mistake. Im using shaan template.

Thanks in advance
Raja